The popular belief will not be a popular belief if it's not from majority (that gay people prefer the more fit/muscled, not necessarily roided, body-type). And like you said, CJ is most-likely straight and yeah, when he finally give in to the insistent public gay demand to film gay content, he prob took the 2 twinks as his first male partners because they're the most willing and available and also... guess what, he's straight and therefore would not pursue another hot guy!
Y'all are using the words Pan and Bi way too much, and abuse the terms biphobia/homophobia simply because someone does not agree with what you insist/believe. If he's legit Bi, he would have at least go for legit attractive dudes who are just as hot as him. A mere OF collab with some dude (esp a twink, less attractive, queer dude) to please the fans doesn't mean he is really attracted to them--he more likely does it for the audience! My only wish is that be could have chosen a better-looking partner, body-type wise.